: Hi, : : I switched my BIOS (Asus M4A78L-M) to use AHCI and ran under AHCI :but I've had to switch back to NATA because after a day or two of light use :I start getting an endless stream of these messages in the log :filling /var (1GB) rapidly, there's no sign of trouble using NATA. : :Aug 26 14:36:53 df1 kernel: ahci0.0: Transient Errors: 40<PCS> :Aug 26 14:36:53 df1 kernel: ahci0.0: Failing all commands : : So far the only way I've found to stop it is to reboot, after which :all is fine for a day or two. What is this most likely to be and how can I :find out more ? : :-- :Steve O'Hara-Smith | Directable Mirror Arrays
PCS is a port-change signal, it would not be signaling that unless there was a problem with the PHY or connector. Do you have a loose connection somewhere? It is also possible to get it if the hard drive power cycles. -Matt